WO1999049498A1 - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
WO1999049498A1
WO1999049498A1 PCT/IB1999/000442 IB9900442W WO9949498A1 WO 1999049498 A1 WO1999049498 A1 WO 1999049498A1 IB 9900442 W IB9900442 W IB 9900442W WO 9949498 A1 WO9949498 A1 WO 9949498A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
metal layer
wall
lamp vessel
electric element
Prior art date
Application number
PCT/IB1999/000442
Other languages
French (fr)
Inventor
Klaus Scholler
Original Assignee
Koninklijke Philips Electronics N.V.
Philips Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V., Philips Ab filed Critical Koninklijke Philips Electronics N.V.
Priority to JP54798299A priority Critical patent/JP4275196B2/en
Priority to AT99906403T priority patent/ATE272896T1/en
Priority to DE69919095T priority patent/DE69919095T2/en
Priority to EP99906403A priority patent/EP0985223B1/en
Publication of WO1999049498A1 publication Critical patent/WO1999049498A1/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/35—Vessels; Containers provided with coatings on the walls thereof; Selection of materials for the coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source

Definitions

  • the invention relates to an electric lamp comprising: a lamp vessel closed in a vacuumtight manner and having a wall; an electric element arranged in the lamp vessel; and a metal layer provided on a substrate.
  • Such an electric lamp is known from DE 3040812-A1.
  • the known lamp is designed for use as a vehicle headlamp and is for this purpose accommodated in a reflector which has a light emission window.
  • a non-translucent shield is placed over part of the lamp in order to prevent that light originating from the electric element will emerge directly through the light emission window of the reflector during lamp operation.
  • This shield is partly surrounded by a hollow cylinder.
  • the metal layer is present on the wall of the hollow cylinder which also partly surrounds the lamp vessel. Among the favorable prope ⁇ ies of the metal layer is that it gives the lamp a colorless appearance in the switched-off state.
  • a comparatively large fraction of the light issues to the exterior through the light emission window at unfavorable angles during lamp operation as a result of this, which involves a serious risk of glare for other road users.
  • a further disadvantage is that the lamp has a comparatively heavy, complicated construction which is difficult to assemble owing to the many separate components.
  • the invention has for its object to provide a lamp of the kind described in the opening paragraph which has a simple construction and in which the above disadvantages are at least largely eliminated.
  • this object is achieved in that the substrate of the metal layer is formed by the wall of the lamp vessel, and in that the metal layer is provided with means for preventing light reflection at its side which faces the electric element.
  • the lamp according to the invention can be manufactured in a very easy and simple manner.
  • the metal layer is reflecting and non-translucent, so that the lamp has the advantage that the separate shield and the hollow cylinder are no longer necessary.
  • the wall or the metal layer is locally provided with a non-reflecting surface, for example made non-translucent, for example frosted by usual techniques, for example by etching or sandblasting.
  • the light is diffusely scattered at this area because the non-reflecting surface has been frosted. Unfavorable reflections of light against this metal layer do not occur.
  • the reflecting properties of the side of the metal layer facing the light emission window gives the lamp, when placed in the reflector, the advantage of a colorless appearance, so that the lamp vessel is substantially invisible through the light emission window. This is perceived as an advantage especially by consumers, because a visible disturbance of the mirroring surface of the reflector by the lamp vessel creates an impression of the reflector being partly fractured or locally attacked.
  • the wall is made non-translucent in that a light-absorbing layer, for example a black layer, is provided on the side of the metal layer facing the electric element.
  • a light-absorbing layer for example a black layer
  • the risk of glare is further reduced thereby because the light is not even scattered diffusely anymore, but is absorbed by the light-absorbing layer before light can be reflected against the metal layer.
  • the fact that the light-absorbing layer is coated with the metal layer at the side facing the light emission window means that the lamp retains the advantage of the lamp vessel having a colorless appearance through the light emission window of the reflector and being substantially invisible.
  • the lamp vessel should be correctly positioned and fixed therein.
  • the alignment and fixation of the lamp vessel in the optical system is comparatively difficult. If the lamp vessel is provided with a lamp cap, the alignment and fixation of the lamp vessel 3 may be achieved by means of this lamp cap. Since the lamp cap cooperates with the optical system, it will occupy a predetermined position in the optical system as a result.
  • the lamp vessel fitted with such a lamp cap can be aligned and fixed comparatively easily relative to the lamp cap outside the optical system, such that the lamp vessel will occupy an accurately defined position in the optical system owing to the cooperation between the lamp cap and the optical system.
  • the lamp according to the invention may preferably be used as a vehicle headlamp.
  • the risk of hazardous situations in road traffic is reduced in that dazzling of other road users by light issuing unfavorably from the light emission window is counteracted.
  • the lamp vessel may be made from hard glass or from quartz glass, i.e. glass with an SiO 2 content of more than 95 % by weight.
  • the layers may be provided by usual techniques, for example by spraying or suspension techniques.
  • the metal layer is, for example, silvery, for example made from one of the elements Ag, Al, Au, Cr, Cu, Ni, Pd, Pt, Rh, or mixtures thereof.
  • the (black) light-absorbing layer is, for example, a paint comprising a pigment, for example ethyl- silicate paint with a mixture of transition metal oxides therein, for example of Fe, Mn, Ti, or of silicon as the black pigment.
  • the electric element may be an incandescent body, in which case the lamp vessel will preferably contain a filling comprising halogen, for example a rare gas with CH 2 Br 2 .
  • the electric element may alternatively be a pair of electrodes, in which case the lamp vessel will contain an ionizable filling, for example a rare gas, mercury, and a mixture of metal halides.
  • the electric element may be made (partly) from undoped or doped tungsten. In the case of doped tungsten, a small percentage of means for regulating crystal growth may have been added, such as 0.01 % by weight of K, Al, and Si together so as to influence the grain size of the tungsten.
  • the lamp has a lamp vessel which is closed in a vacuumtight manner and which has a quartz glass wall 2, with an electric element 3 consisting of two separate incandescent bodies 3a and 3b for a main beam and a passing beam, respectively, inside the lamp vessel 1.
  • the incandescent body 3b for the passing beam is partly screened off by a metal shield 14.
  • the incandescent body 3 is connected to current feed-throughs 5, metal foils made of Mo with 0.5% Y 2 O 3 by weight in the drawing, via internal current conductors 4, made of Mo in the embodiment.
  • the current feed-throughs 5 are embedded next to one another in the wall 2 of the lamp vessel 1.
  • a first, black layer 6 consisting of ethyl-silicate paint with a mixture of magnetite (F ⁇ jO.,), manganese dioxide (MnO 2 ), carbonyl iron (pure Fe), and titanium dioxide (TiO 2 ) as a black pigment therein.
  • a second, silvery metal layer 7 of aluminum is provided over the first, black layer 6.
  • the lamp vessel 1 has a filling of Kr and CH 2 Br 2 , for example at a pressure of 5 bar at room temperature, and when operated at a rated voltage of 12 V will dissipate a power of 55 W.
  • the lamp vessel 1 is accommodated in a parabolic reflector 8.
  • the light generated by the electric element 3 will issue to the exterior through a light emission window 10 after being reflected by a reflecting layer 9.
  • the lamp vessel 1 is fixed in a lamp cap 11.
  • the external current conductors are connected to respective contact tags 12, 13 of the lamp cap 11 , two of which are visible in the drawing.
  • a lamp in accordance with this embodiment is highly suitable for use as a vehicle headlamp.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Glass Compositions (AREA)
  • Liquid Developers In Electrophotography (AREA)
  • Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

The lamp comprises a sealed lamp vessel (1) having a wall (2) which lamp vessel encloses an electric element (3). Current feedthroughs (5), embedded in the wall (2), are connected via internal current leads (4) to the electric element (3). The wall (2) is partly coated with a metal layer (7) which may cooperate with a black layer (6). The lamp has the advantage that the lamp vessel (1) is hardly visible in a reflector body (8) when it is not operating. During operation of the lamp unacceptable glare is avoided due to the presence of the black layer (6) under the metal layer (7).

Description

Electric lamp.
The invention relates to an electric lamp comprising: a lamp vessel closed in a vacuumtight manner and having a wall; an electric element arranged in the lamp vessel; and a metal layer provided on a substrate.
Such an electric lamp is known from DE 3040812-A1. The known lamp is designed for use as a vehicle headlamp and is for this purpose accommodated in a reflector which has a light emission window. A non-translucent shield is placed over part of the lamp in order to prevent that light originating from the electric element will emerge directly through the light emission window of the reflector during lamp operation. This shield is partly surrounded by a hollow cylinder. The metal layer is present on the wall of the hollow cylinder which also partly surrounds the lamp vessel. Among the favorable propeπies of the metal layer is that it gives the lamp a colorless appearance in the switched-off state.
A disadvantage of this separate, non-translucent shield, the separate hollow cylinder, and the metal layer provided thereon, is that they lead to undesirable reflections of the light generated in the electric element. A comparatively large fraction of the light issues to the exterior through the light emission window at unfavorable angles during lamp operation as a result of this, which involves a serious risk of glare for other road users.
A further disadvantage is that the lamp has a comparatively heavy, complicated construction which is difficult to assemble owing to the many separate components.
The invention has for its object to provide a lamp of the kind described in the opening paragraph which has a simple construction and in which the above disadvantages are at least largely eliminated. According to the invention, this object is achieved in that the substrate of the metal layer is formed by the wall of the lamp vessel, and in that the metal layer is provided with means for preventing light reflection at its side which faces the electric element. The lamp according to the invention can be manufactured in a very easy and simple manner. The metal layer is reflecting and non-translucent, so that the lamp has the advantage that the separate shield and the hollow cylinder are no longer necessary. Undesirable reflections against the individual components cannot take place anymore, so that light issuing from the light emission window at unfavorable angles as a result of these reflections and the concomitant risk of glare, for example on the part of other road users, are counteracted.
To prevent reflection of light at the side of the metal layer facing the electric element, the wall or the metal layer is locally provided with a non-reflecting surface, for example made non-translucent, for example frosted by usual techniques, for example by etching or sandblasting. The light is diffusely scattered at this area because the non-reflecting surface has been frosted. Unfavorable reflections of light against this metal layer do not occur. The reflecting properties of the side of the metal layer facing the light emission window gives the lamp, when placed in the reflector, the advantage of a colorless appearance, so that the lamp vessel is substantially invisible through the light emission window. This is perceived as an advantage especially by consumers, because a visible disturbance of the mirroring surface of the reflector by the lamp vessel creates an impression of the reflector being partly fractured or locally attacked.
In a favorable embodiment, the wall is made non-translucent in that a light-absorbing layer, for example a black layer, is provided on the side of the metal layer facing the electric element. The risk of glare is further reduced thereby because the light is not even scattered diffusely anymore, but is absorbed by the light-absorbing layer before light can be reflected against the metal layer. The fact that the light-absorbing layer is coated with the metal layer at the side facing the light emission window means that the lamp retains the advantage of the lamp vessel having a colorless appearance through the light emission window of the reflector and being substantially invisible.
It is important with the use of the lamp in an optical system, for example a reflector, that the lamp vessel should be correctly positioned and fixed therein. The alignment and fixation of the lamp vessel in the optical system is comparatively difficult. If the lamp vessel is provided with a lamp cap, the alignment and fixation of the lamp vessel 3 may be achieved by means of this lamp cap. Since the lamp cap cooperates with the optical system, it will occupy a predetermined position in the optical system as a result. The lamp vessel fitted with such a lamp cap can be aligned and fixed comparatively easily relative to the lamp cap outside the optical system, such that the lamp vessel will occupy an accurately defined position in the optical system owing to the cooperation between the lamp cap and the optical system.
The lamp according to the invention may preferably be used as a vehicle headlamp. The risk of hazardous situations in road traffic is reduced in that dazzling of other road users by light issuing unfavorably from the light emission window is counteracted. The lamp vessel may be made from hard glass or from quartz glass, i.e. glass with an SiO2 content of more than 95 % by weight.
The layers may be provided by usual techniques, for example by spraying or suspension techniques. The metal layer is, for example, silvery, for example made from one of the elements Ag, Al, Au, Cr, Cu, Ni, Pd, Pt, Rh, or mixtures thereof. The (black) light-absorbing layer is, for example, a paint comprising a pigment, for example ethyl- silicate paint with a mixture of transition metal oxides therein, for example of Fe, Mn, Ti, or of silicon as the black pigment.
Current feed-throughs may be embedded next to one another in one wall region, or in regions spaced away from one another, for example lying opposite one another. The electric element may be an incandescent body, in which case the lamp vessel will preferably contain a filling comprising halogen, for example a rare gas with CH2Br2. The electric element may alternatively be a pair of electrodes, in which case the lamp vessel will contain an ionizable filling, for example a rare gas, mercury, and a mixture of metal halides. The electric element may be made (partly) from undoped or doped tungsten. In the case of doped tungsten, a small percentage of means for regulating crystal growth may have been added, such as 0.01 % by weight of K, Al, and Si together so as to influence the grain size of the tungsten.
An embodiment of the lamp according to the invention is shown in a drawing in side elevation. 4
In the drawing, the lamp has a lamp vessel which is closed in a vacuumtight manner and which has a quartz glass wall 2, with an electric element 3 consisting of two separate incandescent bodies 3a and 3b for a main beam and a passing beam, respectively, inside the lamp vessel 1. The incandescent body 3b for the passing beam is partly screened off by a metal shield 14. The incandescent body 3 is connected to current feed-throughs 5, metal foils made of Mo with 0.5% Y2O3 by weight in the drawing, via internal current conductors 4, made of Mo in the embodiment. The current feed-throughs 5 are embedded next to one another in the wall 2 of the lamp vessel 1.
On the wall 2 of the lamp vessel 1, a first, black layer 6 is provided, consisting of ethyl-silicate paint with a mixture of magnetite (FβjO.,), manganese dioxide (MnO2), carbonyl iron (pure Fe), and titanium dioxide (TiO2) as a black pigment therein. A second, silvery metal layer 7 of aluminum is provided over the first, black layer 6.
The lamp vessel 1 has a filling of Kr and CH2Br2, for example at a pressure of 5 bar at room temperature, and when operated at a rated voltage of 12 V will dissipate a power of 55 W.
The lamp vessel 1 is accommodated in a parabolic reflector 8. The light generated by the electric element 3 will issue to the exterior through a light emission window 10 after being reflected by a reflecting layer 9.
The lamp vessel 1 is fixed in a lamp cap 11. The external current conductors are connected to respective contact tags 12, 13 of the lamp cap 11 , two of which are visible in the drawing. A lamp in accordance with this embodiment is highly suitable for use as a vehicle headlamp.

Claims

CLAIMS:
1. An electric lamp comprising: a lamp vessel (1) closed in a vacuumtight manner and having a wall (2); an electric element (3) arranged in the lamp vessel (2); and a metal layer (7) provided on a substrate; characterized in that the substrate of the metal layer (7) is formed by the wall (2) of the lamp vessel (1), and in that the metal layer (7) is provided with means for preventing light reflection at its side which faces the electric element (3).
2. A lamp as claimed in claim 1, characterized in that a light- absorbing layer (6) is provided on the side of the metal layer (7) which faces the electric element (3).
3. A lamp as claimed in claim 1 or 2, characterized in that the lamp vessel (1) is provided with a lamp cap (11).
4. A lamp as claimed in claim 1, 2 or 3, characterized in that the lamp is a vehicle headlamp.
PCT/IB1999/000442 1998-03-26 1999-03-15 Electric lamp WO1999049498A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP54798299A JP4275196B2 (en) 1998-03-26 1999-03-15 light bulb
AT99906403T ATE272896T1 (en) 1998-03-26 1999-03-15 ELECTRIC LAMP
DE69919095T DE69919095T2 (en) 1998-03-26 1999-03-15 ELECTRIC LAMP
EP99906403A EP0985223B1 (en) 1998-03-26 1999-03-15 Electric lamp

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98200960.7 1998-03-26
EP98200960 1998-03-26

Publications (1)

Publication Number Publication Date
WO1999049498A1 true WO1999049498A1 (en) 1999-09-30

Family

ID=8233522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000442 WO1999049498A1 (en) 1998-03-26 1999-03-15 Electric lamp

Country Status (8)

Country Link
US (1) US6270237B1 (en)
EP (1) EP0985223B1 (en)
JP (1) JP4275196B2 (en)
CN (1) CN1296966C (en)
AT (1) ATE272896T1 (en)
DE (2) DE69919095T2 (en)
ES (1) ES2228008T3 (en)
WO (1) WO1999049498A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10211189A1 (en) * 2002-03-14 2003-10-09 Schefenacker Vision Systems Lighting unit, in particular as an additional unit in exterior rear-view mirrors of motor vehicles
DE10258535B4 (en) * 2002-12-14 2008-04-03 Volkswagen Ag Vehicle headlight with a beam stop
US7195667B2 (en) * 2004-06-07 2007-03-27 General Electric Company Composition for opaque coating, lamp with coating, and method of manufacture
CN1309004C (en) * 2004-07-13 2007-04-04 广东雪莱特光电科技股份有限公司 Arc tube for vehicle-mounted high-intensity discharge lamp
WO2006097863A1 (en) * 2005-03-15 2006-09-21 Philips Intellectual Property & Standards Gmbh Halogen lamp
US20080036384A1 (en) * 2006-08-09 2008-02-14 Chowdhury Ashfaqul I Lamp with high reflectance end coat

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE359964B (en) * 1968-03-13 1973-09-10 Philips Nv
GB2064217A (en) * 1979-11-23 1981-06-10 Gte Prod Corp Incandescent lamp having opaque coating
DE3040812A1 (en) * 1980-10-30 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Automobile headlight providing coloured beam output beam - uses filter with colourless appearance to enclose lamp envelope
EP0354620A1 (en) * 1988-08-12 1990-02-14 Philips Patentverwaltung GmbH Electric lamp with a light-absorbing coating
US5111105A (en) * 1990-12-14 1992-05-05 Piaa Corporation Vehicular lighting device
EP0561701A1 (en) * 1992-03-18 1993-09-22 Valeo Vision Coloured light-emitting signal lamp for motor vehicles

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784861A (en) * 1971-02-25 1974-01-08 Philips Corp Lamp with opaque screen
DE2837280A1 (en) * 1978-08-25 1980-03-06 Patra Patent Treuhand ELECTRIC LAMP WITH LIGHT COVERING COVER
NL8201010A (en) * 1981-04-16 1982-11-16 Philips Nv ELECTRICAL REFLECTOR LAMP.
DE8601283U1 (en) * 1986-01-20 1986-08-28 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 8000 München Motor vehicle discharge lamp
HUT51032A (en) * 1988-09-06 1990-03-28 Philips Nv Floodlight lamp
KR100326687B1 (en) * 1992-10-30 2002-06-20 요트.게.아. 롤페즈 Electric lamp and reflector device
DE29507422U1 (en) * 1994-05-10 1995-06-29 Philips Electronics N.V., Eindhoven Socketed high-pressure discharge lamp
WO1996015548A1 (en) * 1994-11-10 1996-05-23 Philips Electronics N.V. Electric lamp

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE359964B (en) * 1968-03-13 1973-09-10 Philips Nv
GB2064217A (en) * 1979-11-23 1981-06-10 Gte Prod Corp Incandescent lamp having opaque coating
DE3040812A1 (en) * 1980-10-30 1982-05-27 Robert Bosch Gmbh, 7000 Stuttgart Automobile headlight providing coloured beam output beam - uses filter with colourless appearance to enclose lamp envelope
EP0354620A1 (en) * 1988-08-12 1990-02-14 Philips Patentverwaltung GmbH Electric lamp with a light-absorbing coating
US5111105A (en) * 1990-12-14 1992-05-05 Piaa Corporation Vehicular lighting device
EP0561701A1 (en) * 1992-03-18 1993-09-22 Valeo Vision Coloured light-emitting signal lamp for motor vehicles

Also Published As

Publication number Publication date
EP0985223B1 (en) 2004-08-04
EP0985223A1 (en) 2000-03-15
JP2002500814A (en) 2002-01-08
ATE272896T1 (en) 2004-08-15
JP4275196B2 (en) 2009-06-10
US6270237B1 (en) 2001-08-07
DE69919095D1 (en) 2004-09-09
ES2228008T3 (en) 2005-04-01
CN1296966C (en) 2007-01-24
CN1262782A (en) 2000-08-09
DE69919095T2 (en) 2005-08-11
DE29905351U1 (en) 1999-06-10

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